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- The three classes List, ListIter, and PhoneNum are defined in one
- header file. They make up the linked list that is in a PhoneBk
- object. You could modify the classes List and ListIter to provide
- linked lists for other applications. To do this you would simply
- define the data member "first" to be a pointer to an object of a
- different type, and adjust the arguments of the member function
- insert(). For simplicity, the definition of List that is shown
- here is meant to be used specifically with the PhoneBk class.
-